Hi!

We have a townhouse in Flagstaff, AZ, as a second home. It's two stories,
about 1600 square feet, has a gas furnace in the attic. It's about a year old
and the furnace has had very little use as it's basically our summer home.

Although most folks in Flagstaff don't have air conditioning, we're thinking of
adding it for the few days in the summer when it gets uncomfortable. If you
don't know the climate, it's relatively low humidity and rarely gets above 90
degrees. A day in the mid-90s is considered a major heat wave, and then it
will drop down to below 60 at night. We're not talking about Phoenix-style
weather, obviously, but we're getting spoiled as we age and do want to add the
air.

I'm just asking for general advice, as I don't want to be totally ignorant when
getting bids from contractors. What do I need? Capacity? Brands to look for?
Brands to avoid? What should it cost? Is there someplace I can read up about
this?

Thanks in advance!

Tom M.